Ultrafast infrared spectroscopy reveals intragap states in methylammonium lead iodide perovskite materials

Artem A. Bakulin; Huib J. Bakker; Zhenhua Sun; Zhuoying Chen

doi:10.1117/12.2064068

9 September 2014 Ultrafast infrared spectroscopy reveals intragap states in methylammonium lead iodide perovskite materials

Artem A. Bakulin, Huib J. Bakker, Zhenhua Sun, Zhuoying Chen

Author Affiliations +

Proceedings Volume 9165, Physical Chemistry of Interfaces and Nanomaterials XIII; 91650U (2014) https://doi.org/10.1117/12.2064068
Event: SPIE NanoScience + Engineering, 2014, San Diego, California, United States

Abstract

Organic-inorganic hybrid materials have recently attracted a lot of attention for optoelectronic applications as they allow combining the flexibility and processibility of organic molecular systems with the good stability and charge-transport properties of inorganic crystalline materials. In this contribution, we report on the use of ultrafast vis-pump / infrared(IR)-probe spectroscopy to investigate the optical signature of charge carrier dynamics in CH₃NH₃PbI₃ perovskite films. We observed that this perovskite shows a complex response which involves strong ground-state bleach contribution. This behaviour differs from most inorganic semiconductors and quantum dot materials that show strong photoinduced absorption in IR upon carrier generation,. The bleaching probably results from a partial filling of intragap states next to the conduction band edge. It may also indicate the existence of a Burstein–Moss type effect in perovskite materials.

Citation Download Citation

Artem A. Bakulin, Huib J. Bakker, Zhenhua Sun, and Zhuoying Chen "Ultrafast infrared spectroscopy reveals intragap states in methylammonium lead iodide perovskite materials", Proc. SPIE 9165, Physical Chemistry of Interfaces and Nanomaterials XIII, 91650U (9 September 2014); https://doi.org/10.1117/12.2064068

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